Mine have a perforated platform, which keeps the waste up, and lets the liquid drain through. I suppose you could make something like it, but it must have an airtight lid because it is an anaerobic process. The price for 2 buckets from Recycle Now was around £25, so by the time you get buckets with lids, something for the plaform, and the taps, then make them, I don't know how much you'd save?
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